KR101493847B1 - Chute with function of reducing falling object speed - Google Patents

Abstract

The present invention relates to a chute, which is a chute for supplying a raw material supplied from the outside to a refining furnace, comprising: a bin to which the raw material is supplied; And a supply pipe connected to the bin and inclined at a predetermined angle,
And a first reduction plate and a reduction projection protruding from an inner circumferential surface of the supply pipe, wherein a length of the first reduction plate is longer than a length of the reduction projection.

Description

[0001] The present invention relates to a chute having a falling deceleration function,

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a chute, and more particularly, to a chute equipped with a fall-down function capable of reducing the falling speed of a raw material falling through a tilted chute to prevent refractory softening of the refining furnace and abrasion of the top lance.

Generally, when stainless steel is produced, a refining furnace 40 having an inner refractory 70 is formed on an inner wall surface as shown in FIG. When the refractory furnace 70 built in the refining furnace 40 is used about 210 times after the refractory furnace 40 is built, the refractory furnace 70 is newly constructed and used in replacement with the refining furnace 40 waiting, The replacement time is about 60 minutes.

The refining furnace 40 is charged with 90 tons of molten steel per unit, and when the molten steel starts refining, the molten steel is kept at 1680 to 1710 DEG C, and alloy iron for adjusting impurities is added to the refining furnace.

2, the conventional chute 50 is a refining furnace such that a cylindrical chute 50 having a length of 9 m and a diameter of 32 cm is maintained at a horizontal angle of 60 ° so as to smoothly introduce raw materials such as coolant and alloy iron, And is installed at the lower end of the hood 20 which collects and discharges the dust and gas generated on the refining furnace 40 during refining.

When the raw material is not refined during the refining, the temperature of the refractory (70) in the refining furnace (40) is raised. When the refractory is put into the refining furnace (40) 70) will cause thermal spalling.

Therefore, the refractory 40 provided at the dropping point of the falling material collides with the raw material falling through the chute 50 is locally worn, and the physical impact applied at the time of inputting the raw material and the reaction in the refining furnace 40 The chemical erosion of the city causes premature wear of the imbricate (70) of the dropping point.

That is, since the amount of wear of the dropping point at which the raw material falls is increased as the number of times of use is increased as compared with the amount of wear of the other portions, the life of the refining furnace (40) There is a problem that the time and cost required for maintenance are excessively increased.

In addition, the auxiliary raw material and the alloy steel collide with the top lance 10 located at the standby position for the purpose of blowing, thereby worn out the outer surface of the top lance 10 to cause leakage due to the piercing, There is a problem that the productivity is lowered due to an increase in the time taken for the winding.

Korea Public Utility Shinan Public Office 2000-0009835 (2000.06.05.)

The object of the present invention is to provide a chute equipped with a fall-down function capable of preventing refractory softening of the refining furnace and premature wear of the top lance.

According to an aspect of the present invention, there is provided a chute for supplying a raw material supplied from the outside to a refining furnace, the chute comprising: a bin to which the raw material is supplied; And a supply pipe connected to the bin and inclined at a predetermined angle,

And a first reduction plate and a reduction projection protruding from an inner circumferential surface of the supply tube, wherein a length of the first reduction plate is longer than a length of the reduction projection.

Here, the lower surface of the supply pipe may have an inclined surface inclined according to the angle and a deceleration surface inclined at a gentler angle than the angle.

The first reduction plate and the reduction projection may be disposed in directions opposite to each other.

The chute may include a second reduction plate installed inside the supply pipe to selectively block the inside of the supply pipe; And a drive unit for switching between a cutoff position in which the second reduction plate cuts the inside of the supply pipe through rotation and a release position in which the second reduction plate cuts off the inside of the supply pipe.

Here, the driving unit may include: a rotating shaft installed perpendicularly to the longitudinal direction of the supply pipe and rotating together with the second reduction plate; And a second cylinder connected to the rotation shaft to provide rotational force to the rotation shaft.

The chute may further include an air folder provided around the supply pipe and having an internal space through which air is supplied from the outside,

And the inner space communicates with the inside of the supply pipe through a spray hole formed in the supply pipe.

At this time, the injection hole is inclined downward toward the lower part of the supply pipe.

According to another aspect of the present invention, there is provided a chute for supplying a raw material supplied from the outside to a refining furnace, comprising: a bin to which the raw material is supplied; A supply pipe connected to the bin and inclined at a predetermined angle; A first reduction plate and a reduction projection protruding from an inner circumferential surface of the supply pipe; A second reduction plate installed inside the supply pipe to selectively block the inside of the supply pipe; A drive unit for switching to a cutoff position in which the second reduction plate intercepts the inside of the supply pipe through rotation and a second release plate to cut off the inside of the supply pipe; A plurality of branch pipes which are moved in a direction parallel to the longitudinal direction of the supply pipe and which are switched to a discharge position for discharging the raw material while being drawn out through a release position located inside the supply pipe and an end of the supply pipe; And an air folder installed around the supply pipe and having an internal space through which air is supplied from the outside.

The chute provided with the function of decelerating falling objects according to the present invention has the following effects.

First, there is an advantage that the fire-softening and early wear of the top lance can be prevented by reducing the falling rate of the raw material falling through the chute.

Second, there is an advantage that heat and gas generated in the refining furnace can be prevented from flowing into the chute.

1 is a view showing a system in which a conventional raw material is charged;
2 is a view showing a conventional suit.
3 is a block diagram of a chute having a deceleration function according to an embodiment of the present invention;
4 is a configuration diagram of a first reduction unit 200 according to an embodiment of the present invention.
5A and 5B are block diagrams of a blocking unit 300 according to an embodiment of the present invention.
6A to 6C are diagrams showing a state before the operation of the direction control unit 500 according to the present invention.
7A to 7C are diagrams showing the operational states of the direction control unit 500 according to the present invention.
8 is a cross-sectional view of a direction control unit 500 according to the present invention.
FIG. 9A is a configuration diagram showing a state before the second deceleration unit 400 according to the present invention is operated. FIG.
FIG. 9B is a configuration diagram showing the state after the second deceleration unit 400 according to the present invention is operated. FIG.
9C is a view showing a state before the rotation shaft 410 and the second speed control plate 430 are coupled with each other according to the present invention.
9D is a view showing a combined state of the rotation shaft 410 and the second speed control plate 430 according to the present invention.
10 is a configuration diagram of a separation unit 600 according to the present invention.

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. It should be understood, however, that the invention is not intended to be limited to the particular embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention. Like reference numerals are used for like elements in describing each drawing.

The terms first, second, A, B, etc. may be used to describe various elements, but the elements should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the first component may be referred to as a second component, and similarly, the second component may also be referred to as a first component. And / or < / RTI > includes any combination of a plurality of related listed items or any of a plurality of related listed items.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The terminology used in this application is used only to describe a specific embodiment and is not intended to limit the invention. The singular expressions include plural expressions unless the context clearly dictates otherwise. In the present application, the terms "comprises" or "having" and the like are used to specify that there is a feature, a number, a step, an operation, an element, a component or a combination thereof described in the specification, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

Unless defined otherwise, all terms used herein, including technical or scientific terms, have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. Terms such as those defined in commonly used dictionaries are to be interpreted as having a meaning consistent with the contextual meaning of the related art and are to be interpreted as either ideal or overly formal in the sense of the present application Do not.

Hereinafter, an embodiment of a suit according to the present invention will be described with reference to the accompanying drawings.

3 to 10, the chute 100 according to the present embodiment is a chute that supplies raw materials supplied from the outside to a refining furnace, and is connected to the bins 60 to which the raw materials are supplied and the bins 60, And a feed pipe 3 inclined at a predetermined angle.

The chute 100 controls the speed and direction of the falling material falling into the refining furnace 40 so that the raw material 30 injected into the refining furnace 40 can control the speed and direction of the falling material 40 and the top lance 10, It is possible to prevent abrasion. Here, the raw material 30 may include additives and ferroalloys.

3, the supply pipe 3 includes a rear supply pipe 2 connected to a lower portion of the bin 60, a front supply pipe 1 connected to a lower portion of the rear supply pipe 2, and a separation unit 600 .

3 and 4, the forward feed pipe 1 is provided with a first reduction unit 200. The first reduction unit 200 reduces the falling speed of the raw material 30 supplied to the bin 60, And includes a first reduction plate 210, a reduction projection 220, a slope 240, and a reduction surface 230.

The first reduction plate 210 protrudes from the upper inner circumferential surface of the front supply pipe 1 and the reduction protrusion 220 protrudes from the upper inner circumferential surface of the front supply pipe 1. [ That is, the first reduction plate 210 and the deceleration protrusion 220 are located on opposite sides of the inner circumferential surface of the front supply pipe 1. At this time, the length of the first reduction plate 210 is preferably longer than the length of the reduction projection 220.

The inclined surface 240 is located on the lower surface of the front supply pipe 1 and is inclined according to the angle of the front supply pipe 1. [

The deceleration surface 230 is located on the lower surface of the front supply pipe 1 and connected to the inclined surface 240 to form a slope at a gentle angle than the angle of the inclined surface 230.

Therefore, the raw material supplied primarily through the bins 60 collides with the first reduction plate 210 while falling from the front supply pipe 1, and the speed thereof is reduced. Secondarily, the first reduction plate 210 Since the collided raw material is decelerated while colliding with the deceleration projection 200 located in the opposite direction of the first deceleration plate 210 and the acceleration is reduced while passing through the deceleration surface 230, .

3 and 5, the blocking unit 300 is installed around the rear supply pipe 2 to form an air curtain inside the rear supply pipe 2, so that heat and gas generated in the refining furnace 40 So that it is prevented from moving into the supply pipe 3. By doing so, it is possible to prevent the chute 100 from being damaged due to heat and gas.

The cutoff unit 300 includes an air folder 310, a spray hole 320, an air supply nipple 380, an air supply pipe 330 and a compressor 340.

The air folder 310 is provided around the rear supply pipe 2 to form an inner space for filling the air supplied into the rear supply pipe 2 together with the outer surface of the rear supply pipe 2. That is, air filled in the air folder 310 is supplied into the rear supply pipe 2.

The spray hole 320 is a hole through which air is injected into the rear supply pipe 2 and communicates the inner space of the air folder 310 and the inside of the rear supply pipe 2. At this time, it is preferable that the spray hole 320 is formed on the outer circumferential surface of the rear supply pipe 2 facing the air folder 310, and the spray hole 320 is inclined downward toward the lower portion of the rear supply pipe 2. The plurality of injection holes 320 may be arranged to be symmetrical with respect to the longitudinal direction of the rear supply pipe 2.

The air supply nipple 380 is installed on the outer surface of the air folder 310 and provides a passage for filling the air inside the air folder 310.

The air supply pipe 330 is installed between the air supply nipple 380 and the compressor 340 so that the air generated by the compressor 340 is supplied to the air folder 310 through the air supply nipple 380.

As a result, the air filled in the air folder 310 is injected through the spray hole 320 of the rear supply pipe 2, so that an air curtain is formed inside the rear supply pipe 2. As a result, It is possible to interrupt the generated heat and gas, and at the same time to decelerate the falling speed of the raw material 30 falling.

9A to 9C, the second deceleration unit 400 is provided in the rear supply pipe 2 to decelerate the falling speed of the falling material 30, and includes a rotating shaft 410, a second reduction plate 430, , And a second cylinder (450).

The rotary shaft is rotatably installed inside the rear supply pipe 2 perpendicular to the longitudinal direction of the rear supply pipe 2 (410). Here, the rotation shaft 410 is connected to the second cylinder 450, and rotates in accordance with the length expansion / contraction action of the second cylinder 450.

The second reduction plate 430 is installed inside the rear supply pipe 2 to selectively block the inside of the rear supply pipe 2 and connected to the rotation axis 410 to rotate together with the rotation axis 410. The second reduction plate 430 rotates between a blocking position for blocking the interior of the rear supply pipe 2 and a release position for unblocking the interior of the rear supply pipe 2. At this time, two fixing plates 420 are coupled to the rotary shaft 410, and a second reduction plate 430 is coupled between the two fixing plates 420.

The second cylinder 450 is connected to the rotating shaft 410 to provide a driving force for rotating the rotating shaft 410 and includes a second cylinder body 451 and a second cylinder rod 452. Specifically, a connecting frame 480 connecting the rotating shaft 410 and the second cylinder rod 452 is provided at an end of the rotating shaft 410. That is, the second cylinder 450 is rotated so that the second reduction plate 430 is switched to the blocking position for blocking the inside of the rear supply pipe 2 and the release position for unblocking the inside of the rear supply pipe 2 Thereby providing a driving force.

Since the rotation shaft 410 is connected to one end of the connection frame 480 and the second cylinder rod 452 is connected to the other end of the connection frame 480, And is rotated at the set angle. A lever lever 460 is installed at an end of the second cylinder rod 452 and a second lever 470 is installed at the other end of the connection frame 480 to connect the lever lever 460 and the second lever 470, It is also possible to connect the second cylinder rod 452 to the connection frame 480.

As a result, the rotary shaft 410 rotates in accordance with the length expansion / contraction action of the second cylinder rod 452, so that the second reduction plate 430 rotates to rotate the cross section of the rear supply pipe 2 inside the rear supply pipe 2 As shown in FIG. Therefore, the raw material 30 falling in the rear supply pipe 2 collides with the second reduction plate 430, and the falling speed is reduced.

6 to 8, the direction control unit 500 is installed at the end of the rear supply pipe 2 and switches the moving direction of the falling raw material 30 so that the raw material 30 collides with the top lance 10 As well as controlling the position where the raw material 30 falls from the inside of the refining furnace 30 to prevent the refractory furnace 40 from being locally abraded.

The direction control unit 500 includes a first cylinder 510, a first lever 513, a fixing pin 560, a first branch 540, a second branch 550, a spring 562, (563) and a bush (561).

The first branch pipe 540 and the second branch pipe 550 move in the direction parallel to the longitudinal direction of the rear supply pipe 2 and are connected to the release position located inside the rear supply pipe 2, So that the position can be switched to a discharge position for discharging the raw material 30. [ At this time, the first branch pipe 540 and the second branch pipe 560 can have predetermined angles at the discharge position.

The first branch pipe 540 and the second branch pipe 550 are located at the ends of the rear supply pipe 2 and are movable inside or outside the rear supply pipe 2 and are connected to each other by the raw material 30 It is possible to prevent the raw material 30 from colliding with the top lance 10 and to change the falling position in the refining furnace 40. [

The first lever 513 is connected to the first cylinder 510 and the other end is connected to the fixing pin 560. The first lever 513 and first The fixing pin 560 connected to the lever 513 moves in parallel with the longitudinal direction of the first cylinder 510. [ At this time, it is also possible to directly connect the first cylinder 510 to the fixing pin 560.

The fixing pin 560 connects one side of the first branch pipe 540 and the second branch pipe 550 to the first lever 513 and the first branch pipe 540 and the second branch pipe 560 The first lever 513 rotates with respect to the fixed pin 560 as it moves.

More specifically, when the length of the first cylinder rod 512 connected to the first cylinder body 511 is increased, the fixing pin 560 connected to the first cylinder rod 512 via the first lever 513, The first branch pipe 540 and the second branch pipe 550 are moved to the outside of the rear supply pipe 2 in the longitudinal direction of the rear supply pipe 2 so that the first branch pipe 540 and the second branch pipe 550 move . At this time, the first branch pipe 540 and the second branch pipe 550 are formed at a predetermined angle around the fixing pin 560 by the elastic force of the spring 562 installed on the fixing pin 560, It is possible to prevent the raw material 30 from colliding with the top lance 10 and to change the falling position in the refining furnace 40. [

On the other hand, when the length of the first cylinder rod 512 connected to the first cylinder body 511 is reduced, the fixing pin 560 connected to the first cylinder rod 512 via the first lever 513, The first branch pipe 540 and the second branch pipe 550 move to the inside of the rear supply pipe 2 in the longitudinal direction of the rear supply pipe 2 in the longitudinal direction of the rear supply pipe 2. At this time, the spring 562 provided on the fixing pin 560 is compressed by the attraction force of the first cylinder 510.

The length of the first cylinder rod 512 is changed so that the position of the first branch pipe 540 and the second branch pipe 550 at the rear end of the rear supply pipe 2 is controlled to adjust the elastic force of the spring 562 It is possible to control the separation angle between the first branch pipe 540 and the second branch pipe 550 which are separated by the fixing pin 560.

The first branch pipe 540 and the second branch pipe 550 are connected to the fixing pin 560 with a fixing pin 56 as a center so that the first branch pipe 540 and the second branch pipe 550 can form a certain angle, 550 may be provided with a spring 562 that provides an elastic force. At this time, it is preferable that the spring 562 is a torsion spring.

The separation plate 563 is connected to the bush 561 coupled to the outer circumferential surface of the fixing pin 560 and the raw material 30 falling through the rear supply pipe 2 is supplied to the first branch pipe 540 and the second branch pipe 540. [ The first branch pipe 540 and the second branch pipe 550 are prevented from being worn by the collision with the raw material 30. At this time, it is preferable that the separation plate 563 has a semicircular shape in cross section so that the raw material 30 can be easily separated.

6 and 7, the direction control unit 500 may further include a variable portion 530 and an elastic portion 520. [

The variable portion 530 is provided on the outside of the first branch pipe 540 and the second branch pipe 550 so as to be capable of changing the angle of separation of the first branch pipe 540 and the second branch pipe 550 The first branch pipe 540 and the second branch pipe 550 can be expanded or contracted in accordance with a change in length occurring on the outer surface of the first branch pipe 540 and the second branch pipe 550.

That is, when the separation angle is increased, the lengths of the outer surfaces of the first branch pipe 540 and the second branch pipe 550 increase, and when the separation angle decreases, the first branch pipe 540 and the second branch pipe 550 The length of the outer surface of the first branch pipe 550 and the length of the outer surface of the second branch pipe 550 can be expanded and contracted due to the change in length of the outer surface of the first branch pipe 540 and the second branch pipe 550, It is possible to prevent the outer surface of the engine 540 and the first branch pipe 550 from being damaged.

The variable portion 530 may include a plurality of rollers 531 and a chain 532 connecting one end of the rollers 531. [

The roller 531 is connected to the outside of the first branch pipe 540 and the second branch pipe 550 so that the first branch pipe 540 and the second branch pipe 550 are connected to the discharge position and the release position And moves along the inside of the rear supply pipe 2 with respect to the switching. That is, when the separation angle increases, the length of the variable portion 530 increases as the roller 531 connected to the chain 532 advances toward the first branch pipe 540 and the second branch pipe 550, respectively, When the separation angle is decreased, the length of the variable portion 530 decreases due to the backward movement of the roller 531. [

The elastic part 520 is connected to the roller 531 to provide an elastic force when the roller 531 is retracted and includes an elastic body 521, a movable frame 522, a fixed frame 523, and a fixed shaft 524 .

The moving frame 522 is connected to the first branch pipe 540 and the second branch pipe 550 and moves together with the first branch pipe 540 and the second branch pipe 550. That is, the moving frame 522 is connected to the roller 531 located at one end of the variable portion 530 and moves together with the roller 531. [

The fixed frame 523 is fixed to the rear supply pipe 2 and connected to the moving frame 522 through the elastic body 521. [

The elastic body 521 connects the fixed frame 523 and the movable frame 522 and provides the elastic force in the direction in which the movable frame 522 faces the fixed frame 523. [ The elastic body 521 is moved in a direction in which the roller 531 moves when the first branch pipe 540 and the second branch pipe 550 move into the rear supply pipe 2 due to the decrease in length of the first cylinder rod 512 And provides an elastic force to the roller 531 so as to be able to move backward. At this time, the movable frame 522 and the fixed frame 523 are connected by a fixed shaft 524, and an elastic body 521 such as a spring may be provided on the fixed shaft 524.

The fixing pin 560 is moved by the length expansion and contraction of the first cylinder 510 to control the separation angle formed by the first branch pipe 540 and the second branch pipe 550, It is possible to prevent collision with the top lance 10 as well as to prevent localized wear of the refractory furnace 70 of the refining furnace 40. [

4 and 10, the separation unit 600 is installed between the front supply pipe 1 and the rear supply pipe 2 so that the second reduction unit 400 and the direction control unit 500 are worn and repaired An upper side flange 615, a lower side separation unit 620, and a lower side flange 615. The upper side flange 615, the lower side separation unit 620, and the lower side flange 615 are provided for facilitating separation of the front supply pipe 1 and the rear supply pipe 2, 625).

One end of the upper separation unit 610 and the lower separation unit 620 are coupled to the first reduction unit 200 with a fixing bolt and the other end is provided with an upper flange 615 and a lower flange 615.

The upper flange 615 and the lower flange 625 are fastened to the upper flange 350 of the shielding unit 300 with a fixing bolt. Therefore, by disassembling the fixing bolts coupled to the separation unit 600, the second deceleration unit 400 and the direction control unit 500 can be easily replaced and repaired.

1: forward supply pipe 2: rear supply pipe
3: Supply pipe 10: Top lance
20: Hood 30: Raw material
40: refining furnace 50, 100: suits
60: Bean 70: My good friend
200: first reduction unit 210: first reduction plate
220: deceleration projection 230:
240: inclined plane 300: blocking unit
310: Air folder 320:
330: Air supply pipe 340: Compressor
350: Upper flange 360: Lower flange
370: Fastening hole 380: Air supply nipple
400: second reduction unit 410: rotating shaft
420: Fixing plate 430: Second reduction plate
440: Support frame 450: Second cylinder
451: second cylinder body 452: second cylinder rod
460: Lever holder 470: Second lever
480: connection frame 500: direction control unit
510: first cylinder 511: first cylinder body
512: first cylinder rod 513: first lever
520: elastic part 521: elastic material
522: Moving frame 523: Fixing frame
524: fixed shaft 530: variable portion
531: roller 532: chain
540: First branch office 550: Second branch office
560: Fixing pin 561: Bush
562: spring 563: separator plate
600: separation unit 610: upper separation unit
615: upper side flange 620: lower side separation unit
625: Lower flange

Claims (8)

A chute for supplying a raw material supplied from outside to a refining furnace,
A bin through which the raw material is supplied;
A supply conduit connected to the bin and inclined at a predetermined angle;
A plurality of branch pipes which move in a direction parallel to the longitudinal direction of the supply pipe and which are switched to a discharge position for discharging the raw material while being drawn out through a release position located inside the supply pipe and an end of the supply pipe;
And an air folder installed around the supply pipe and having an internal space through which air is supplied from the outside,
The supply pipe,
And a plurality of spray holes disposed along the periphery of the supply pipe facing the air folder and having an outer circumferential surface of the supply pipe penetrated so that the inner space and the inside of the supply pipe communicate with each other,
And a first reduction plate and a reduction projection protruding from an inner circumferential surface of the supply pipe.
The method according to claim 1,
Wherein the lower surface of the supply pipe has an inclined surface inclined according to the angle and a deceleration surface inclined at a gentle angle than the angle.
The method according to claim 1,
Wherein the first reduction plate and the reduction projection are disposed in directions opposite to each other.
The method according to claim 1,
And the length of the first reduction plate is longer than the length of the reduction projection.
The method according to claim 1,
The suits
A second reduction plate installed inside the supply pipe to selectively block the inside of the supply pipe;
And a drive unit for switching to a cutoff position in which the second reduction plate intercepts the inside of the supply pipe through rotation and a second cutoff position in which the second reduction plate releases the inside of the supply pipe.
The method of claim 5,
The driving unit includes:
A rotating shaft installed perpendicularly to the longitudinal direction of the supply pipe and rotating together with the second reduction plate;
And a second cylinder connected to the rotary shaft to provide a rotational force to the rotary shaft.
The method according to claim 1,
Wherein the spray hole is inclined downward toward a lower portion of the supply pipe.
A chute for supplying a raw material supplied from outside to a refining furnace,
A bin through which the raw material is supplied;
A supply conduit connected to the bin and inclined at a predetermined angle;
A first reduction plate and a reduction projection protruding from an inner circumferential surface of the supply pipe;
A second reduction plate installed inside the supply pipe to selectively block the inside of the supply pipe;
A drive unit for switching to a cutoff position in which the second reduction plate intercepts the inside of the supply pipe through rotation and a second release plate to cut off the inside of the supply pipe;
A plurality of branch pipes which move in a direction parallel to the longitudinal direction of the supply pipe and which are switched to a discharge position for discharging the raw material while being drawn out through a release position located inside the supply pipe and an end of the supply pipe;
And an air folder installed around the supply pipe and having an internal space through which air is supplied from the outside,
The supply pipe,
And a plurality of spray holes disposed along the periphery of the supply pipe facing the air folder and having an outer peripheral surface of the supply pipe penetrated so that the inner space and the inside of the supply pipe communicate with each other.

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